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2 070 193

(13)

C1

(51)

IPC

(21) (22)

Application

93042758/04, 1993-08-27

(22)

Actual filing date

1993-08-27

(45)

Published

1996-12-10

(72)

Inventor

Pikalov V.E.Frygina V.A.Smirnov L.D.

(73)

Holder

Vserossijskij Nauchnyj Tsentr Po Bezopasnosti Biologicheski Aktivnykh Veshchestv

PROCESS FOR PREPARING 5-BROMONICOTINIC ACID Russian patent published in 1996 - IPC

Abstract RU 2070193 C1

FIELD: chemical industry. SUBSTANCE: process comprises reacting nicotinic acid with thionyl chloride at 75-80 C, followed by formulation at 110-120 C for 10-14 h in the presence of Lewis acid catalyst the composition of which is different form thionyl chloride, hydrolyzing the reaction mixture with water, recovering the desired product by using inorganic base at pH of 2.5-3.0, the amount of catalyst being 2.0-8.0 wt% of the starting nicotinic acid. EFFECT: more efficient preparation process. 1 tbl

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RU 2 070 193 C1

Authors

Pikalov V.E.

Frygina V.A.

Smirnov L.D.

Dates

1996-12-10—Published

1993-08-27—Filed

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